C#

        private void picItem_MouseDown(object sender, MouseEventArgs e)<br />
        {<br />
            // Starting point of the selection:<br />
            if (e.Button == MouseButtons.Left)<br />
            {<br />
                _selecting = true;<br />
                _selection = new Rectangle(new Point(e.X, e.Y), new Size());<br />
            }<br />
        }<br />
<br />
        private void picItem_MouseUp(object sender, MouseEventArgs e)<br />
        {<br />
            if (e.Button == MouseButtons.Left && _selecting)<br />
            {<br />
                Rectangle cropRect = _selection; <br />
<br />
                using (Graphics g = Graphics.FromImage(picItem.Image))<br />
                {<br />
                    g.FillRectangle(Brushes.White, new Rectangle(0, 0, _selection.X, _selection.Y));<br />
                }<br />
<br />
                picItem.Refresh();<br />
                _selecting = false;<br />
            }<br />
        }<br />
<br />
        private void picItem_MouseMove(object sender, MouseEventArgs e)<br />
        {<br />
            // Update the actual size of the selection:<br />
            if (_selecting)<br />
            {<br />
                    _selection.Width = e.X - _selection.X;<br />
                    _selection.Height = e.Y - _selection.Y;<br />
<br />
                // Redraw the picturebox:<br />
                picItem.Refresh();<br />
<br />
                lblLocation.Text = "Height = " + _selection.Height.ToString() + ", Width = " <br />
                                   + _selection.Width.ToString();<br />
            }<br />
        }

listView1.VirtualMode = true;

When the ListView is in virtual mode, you cannot add items to the ListView items collection. Use  the VirtualListSize property instead to change the size of the ListView items collection.